1. 直接写出得数。
3.5÷0.7=
0.6+0.24=
0.3×0.4=
0.44×1000=
5.7-0.8=
0.27÷0.09=
0.64÷3.2=
4÷0.01=
3.5÷0.7=
5
0.6+0.24=
0.84
0.3×0.4=
0.12
0.44×1000=
440
5.7-0.8=
4.9
0.27÷0.09=
3
0.64÷3.2=
0.2
4÷0.01=
400
答案
5
0.84
0.12
440
4.9
3
0.2
400
0.84
0.12
440
4.9
3
0.2
400
2. 用竖式计算,除不尽的保留两位小数。
14÷0.56=
3.914÷0.19=
0.7÷0.36≈
3.7×6.5=
2.05×2.4=
9.8×0.86≈
14÷0.56=
25
3.914÷0.19=
20.6
0.7÷0.36≈
1.94
3.7×6.5=
24.05
2.05×2.4=
4.92
9.8×0.86≈
8.43
答案
1. 14÷0.56
```
25
0.56)1400.
112
---
280
280
---
0
```
=25
2. 3.914÷0.19
```
20.6
0.19)391.4
380
---
114
114
---
0
```
=20.6
3. 0.7÷0.36≈
```
1.944...
0.36)70.000
36
---
340
324
---
160
144
---
160
```
≈1.94
4. 3.7×6.5
```
3.7
×6.5
----
185
222
----
24.05
```
=24.05
5. 2.05×2.4
```
2.05
× 2.4
-----
820
410
-----
4.920
```
=4.92
6. 9.8×0.86≈
```
9.8
×0.86
-----
588
784
-----
8.428
```
≈8.43
```
25
0.56)1400.
112
---
280
280
---
0
```
=25
2. 3.914÷0.19
```
20.6
0.19)391.4
380
---
114
114
---
0
```
=20.6
3. 0.7÷0.36≈
```
1.944...
0.36)70.000
36
---
340
324
---
160
144
---
160
```
≈1.94
4. 3.7×6.5
```
3.7
×6.5
----
185
222
----
24.05
```
=24.05
5. 2.05×2.4
```
2.05
× 2.4
-----
820
410
-----
4.920
```
=4.92
6. 9.8×0.86≈
```
9.8
×0.86
-----
588
784
-----
8.428
```
≈8.43
3. 计算下面各题,能简算的要简算。
0.48+4.8÷0.16
19.2÷12.5÷8
7.8×9.9
63-6.3-3.7
3.6×3.4+6.6×3.6
36×[(5-0.68)÷12]
0.48+4.8÷0.16
19.2÷12.5÷8
7.8×9.9
63-6.3-3.7
3.6×3.4+6.6×3.6
36×[(5-0.68)÷12]
答案
1. $0.48 + 4.8 ÷ 0.16$
$= 0.48 + 30$
$= 30.48$
2. $19.2 ÷ 12.5 ÷ 8$
$= 19.2 ÷ (12.5 × 8)$
$= 19.2 ÷ 100$
$= 0.192$
3. $7.8 × 9.9$
$= 7.8 × (10 - 0.1)$
$= 7.8 × 10 - 7.8 × 0.1$
$= 78 - 0.78$
$= 77.22$
4. $63 - 6.3 - 3.7$
$= 63 - (6.3 + 3.7)$
$= 63 - 10$
$= 53$
5. $3.6 × 3.4 + 6.6 × 3.6$
$= 3.6 × (3.4 + 6.6)$
$= 3.6 × 10$
$= 36$
6. $36 × [(5 - 0.68) ÷ 12]$
$= 36 × [4.32 ÷ 12]$
$= 36 × 0.36$
$= 12.96$
$= 0.48 + 30$
$= 30.48$
2. $19.2 ÷ 12.5 ÷ 8$
$= 19.2 ÷ (12.5 × 8)$
$= 19.2 ÷ 100$
$= 0.192$
3. $7.8 × 9.9$
$= 7.8 × (10 - 0.1)$
$= 7.8 × 10 - 7.8 × 0.1$
$= 78 - 0.78$
$= 77.22$
4. $63 - 6.3 - 3.7$
$= 63 - (6.3 + 3.7)$
$= 63 - 10$
$= 53$
5. $3.6 × 3.4 + 6.6 × 3.6$
$= 3.6 × (3.4 + 6.6)$
$= 3.6 × 10$
$= 36$
6. $36 × [(5 - 0.68) ÷ 12]$
$= 36 × [4.32 ÷ 12]$
$= 36 × 0.36$
$= 12.96$
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